Claims
- 1. A tripod type constant velocity universal joint comprising:
- a driving part having an axis of rotation;
- a driven part having an axis of rotation;
- a spider member, integral with one of said parts, having a concentrated portion and three roller supporting rods extended radially from said concentrated portion thereof with an angle of 120 degrees formed therebetween;
- three roller elements respectively rotatably supported on said roller supporting rods and slidable along said roller supporting rods in the axial directions of said rods; and
- a pot member, integral with the other of said parts, defining three pairs of longitudinal roller raceways and respectively receiving said three roller elements between said pairs of roller raceways, each pair of roller raceways having a top end side and a base side with a central portion therebetween along a longitudinal axis thereof,
- said longitudinal axis of said each pair of roller raceways having an internal surface approaching, along straight lines, a rotational axis of said pot member on both of said top end side and said base side, and the distances R between the longitudinal axis of said each pair of roller raceways and the rotational axis of said pot member on said both sides being shorter than the distance R.sub.o therebetween at said central portion thereof, and
- said longitudinal axis of said each pair of roller raceways being symmetrically configured with respect to a central point in said central portion of each said pair of roller raceways in their longitudinal direction, said central point being a symmetry point,
- whereby an approach quantity .delta. of the longitudinal axis of said roller raceways, defined by the difference between said distances Ro and R at both ends thereof, with respect to the rotational axis of said pot member, and the variation of the approach quantity in response to the position of said roller elements moving in the longitudinal axis of said roller raceways, are decreased by said straight lines, thereby decreasing the quantity of nonconstant rotational velocity thereof and decreasing the length thereof in their longitudinal direction to reduce the size and weight thereof.
- 2. A tripod type constant velocity universal joint according to claim 1, wherein:
- each pair of roller raceways gradually approaches the rotational axis of said pot member along straight lines in the longitudinal direction from said central portion to both ends of said pair of roller raceways.
- 3. A tripod type constant velocity universal joint according to claim 1, wherein:
- each pair of roller raceways is in parallel with respect to the rotational axis of said pot member between points which are equally spaced from said central point on both sides thereof in the longitudinal direction thereof, and
- each pair of roller raceways gradually approaches the rotational axis of said pot member along straight lines from said spaced points to both ends of said pair of roller raceways.
- 4. A tripod type constant velocity universal joint according to claim 2, wherein:
- each pair of roller raceways is provided along two straight lines having predetermined angles .theta..sub.o to the rotational axis of said pot member but with opposite senses and connecting said central point and both ends of said pair of roller raceways.
- 5. A tripod type constant velocity universal joint according to claim 3, wherein:
- each pair of roller raceways is provided along two straight lines having predetermined angles .theta..sub.o to the rotational axis of said pot member but with opposite senses and connecting said spaced points and both ends of said pair of roller raceways.
- 6. A tripod type constant velocity universal joint according to claim 1, wherein:
- each pair of roller raceways is provided along an arc line having a predetermined radius r of curvature and a length passing through a central point of the pair of roller raceways between points which are equally spaced from said central point on both sides thereof in the longitudinal direction thereof, and is also provided along said two straight lines having a predetermined angle .theta..sub.o to the rotational axis of said pot member and connecting said spaced points from said neutral point and both ends of said pair of roller raceways.
- 7. A tripod type constant velocity universal joint according to claim 4, wherein:
- said angle .theta..sub.o of said straight lines of said pair of roller raceways is 4.645.degree..
- 8. A tripod type constant velocity universal joint according to claim 4, wherein:
- said angle .theta..sub.o of said straight lines of said pair of roller raceways is 6.2.degree..
- 9. A tripod type constant velocity universal joint according to claim 5, wherein:
- said angle .theta..sub.o of said straight lines of said pair of roller raceways is 6.2.degree..
- 10. A tripod type constant velocity universal joint according to claims 7 or 8 wherein:
- said distance R.sub.o defined by the distance from the rotational axis of said pot member to the longitudinal axis of each pair of roller raceways is 19.9 mm.
- 11. A tripod type constant velocity universal joint according to claim 8, wherein:
- said distance R.sub.o defined by the distance from the rotational axis of said pot member to the longitudinal axis of each pair of roller raceways is 20.436 mm.
- 12. A tripod type constant velocity universal joint according to claim 2, wherein
- an arc line is formed in the intersecting portion of said straight lines in said roller raceways and smoothly connects to said straight lines.
- 13. A tripod type constant velocity universal joint according to claim 3 wherein
- an arc line is formed in the intersecting portion of said straight lines in said roller raceways and smoothly connects to said straight lines.
- 14. A tripod type constant velocity universal joint according to claim 1, wherein
- the relative sliding of said driving part and driven part in the axial direction thereof is prevented by fixing means so that they do not relatively slide in the axial direction thereof.
Priority Claims (2)
Number |
Date |
Country |
Kind |
53-113122 |
Sep 1978 |
JPX |
|
79103455.6 |
Sep 1979 |
EPX |
|
CROSS REFERENCE TO RELATED APPLICATION
The present application is a continuation-in-part application of our co-pending application Ser. No. 073,872, filed Sept. 10, 1979 for TRIPOD TYPE CONSTANT VELOCITY UNIVERSAL JOINT, and now abandoned.
US Referenced Citations (7)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
73872 |
Sep 1979 |
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